from stdint import *
import pyzlib
import zhuff
import zdef
from stdio import printf
import stdlib
from string import strlen
import string
import t, c


test_passed: t.CInt = 0
test_failed: t.CInt = 0
def check(name: str, condition: t.CInt, detail: str):
    global test_passed, test_failed
    if condition:
        test_passed += 1
        printf("  [PASS] %s\n", name)
    else:
        test_failed += 1
        printf("  [FAIL] %s  -- %s\n", name, detail if detail else "")

def print_hex_test(data: BYTEPTR, length: t.CSizeT, max_show: t.CSizeT):
    if not data or length == 0:
        printf("(empty)\n")
        return
    show: t.CSizeT = max_show if (length > max_show) else length
    i: t.CSizeT
    for i in range(show):
        printf("%02X ", data[i])
    if length > max_show:
        printf("... (%zu bytes total)", length)
    printf("\n")

def print_separator():
    printf("  -------------------------------------------\n")

def section_header(title: str):
    printf("\n+-- %s --+\n", title)

def section_footer():
    printf("+--------------------------------------------+\n")

# ============================================================

def test_version():
    section_header("Version Info")

    ver: str = pyzlib.ZLIB_VERSION
    printf("  ZLIB_VERSION (compile-time) : %s\n", ver)
    check("ZLIB_VERSION not None", ver != None, "version string is None")
    check("ZLIB_VERSION not empty", strlen(ver) > 0, "version string is empty")

    runtime_ver: str = pyzlib.runtime_version()
    printf("  ZLIB_RUNTIME_VERSION       : %s\n", runtime_ver)
    check("runtime version not None", runtime_ver != None, "runtime version is None")
    check("runtime version not empty", strlen(runtime_ver) > 0, "runtime version is empty")

    section_footer()


def test_compress_decompress():
    section_header("compress / decompress")

    inp: str = "Hello, World! This is a test of zlib compression and decompression."
    input_length: t.CSizeT = strlen(inp)
    printf("  Input (%zu bytes): \"%s\"\n", input_length, inp)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    check("compress returns non-None", compressed != None, "compress returned None")
    check("compress output size > 0", out_length > 0, "compressed size is 0")
    check("compress output produced", out_length > 0, "compressed size is 0")

    printf("  Compressed (%zu bytes): ", out_length)
    print_hex_test(compressed, out_length, 32)
    printf("  Compression ratio: %.1f%%\n", t.CDouble(out_length) / input_length * 100)

    dec_length: t.CSizeT = 0
    decompressed: BYTEPTR = pyzlib.decompress(compressed, out_length,
                                                   pyzlib.MAX_WBITS, pyzlib.DEF_BUF_SIZE, c.Addr(dec_length))
    check("decompress returns non-None", decompressed != None, "decompress returned None")
    check("decompress output size matches input", dec_length == input_length, "size mismatch")
    check("decompress output matches input", decompressed != None and memcmp(decompressed, inp, input_length) == 0, "content mismatch")

    printf("  Decompressed (%zu bytes): \"%.*s\"\n", dec_length, t.CInt(dec_length), str(decompressed))

    free(compressed)
    free(decompressed)
    section_footer()


def test_compress_levels():
    section_header("Compression Levels")

    inp: str = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
    input_length: t.CSizeT = strlen(inp)
    printf("  Input (%zu bytes): \"%s\"\n", input_length, inp)

    out_length: t.CSizeT = 0

    c0: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                       pyzlib.Z_NO_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    check("level 0 compress OK", c0 != None, "level 0 returned None")
    printf("  Level 0 (Z_NO_COMPRESSION): %zu bytes\n", out_length)
    length0: t.CSizeT = out_length
    free(c0)

    c1: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                       pyzlib.Z_BEST_SPEED, pyzlib.MAX_WBITS, c.Addr(out_length))
    check("level 1 compress OK", c1 != None, "level 1 returned None")
    printf("  Level 1 (Z_BEST_SPEED)    : %zu bytes\n", out_length)
    free(c1)

    c6: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                       pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    check("level -1 compress OK", c6 != None, "default level returned None")
    printf("  Level -1 (DEFAULT)        : %zu bytes\n", out_length)
    free(c6)

    c9: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                       pyzlib.Z_BEST_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    check("level 9 compress OK", c9 != None, "level 9 returned None")
    printf("  Level 9 (Z_BEST_COMPRESS) : %zu bytes\n", out_length)
    length9: t.CSizeT = out_length
    free(c9)

    check("level 9 smaller than level 0", length9 < length0, "level 9 not smaller than level 0")

    section_footer()


def test_compressobj():
    section_header("compressobj (incremental)")

    part1: str = "Hello, "
    part2: str = "World!"
    printf("  Part 1: \"%s\"\n", part1)
    printf("  Part 2: \"%s\"\n", part2)

    out_length: t.CSizeT = 0

    s: pyzlib.Compress | t.CPtr = pyzlib.compressobj(pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.DEFLATED,
                                         pyzlib.MAX_WBITS, pyzlib.DEF_MEM_LEVEL,
                                         pyzlib.Z_DEFAULT_STRATEGY, None, 0)
    check("compressobj created", s != None, "compressobj is None")
    print_separator()

    c1: BYTEPTR = s.compress(BYTEPTR(part1), strlen(part1), c.Addr(out_length))
    check("compress part1 OK", c1 != None, "compress part1 failed")
    printf("  Compressed part1: %zu bytes  -> ", out_length)
    print_hex_test(c1, out_length, 16)
    total: t.CSizeT = out_length
    all: BYTEPTR = None
    if out_length > 0 and c1:
        all = BYTEPTR(malloc(total))
        if all: memcpy(all, c1, out_length)
    free(c1)

    c2: BYTEPTR = s.compress(BYTEPTR(part2),
                                                strlen(part2), c.Addr(out_length))
    check("compress part2 OK", c2 != None, "compress part2 failed")
    printf("  Compressed part2: %zu bytes  -> ", out_length)
    print_hex_test(c2, out_length, 16)
    if out_length > 0 and c2:
        new_all: BYTEPTR = BYTEPTR(realloc(all, total + out_length))
        if new_all:
            all = new_all
            memcpy(all + total, c2, out_length)
            total += out_length
    free(c2)

    c3: BYTEPTR = s.flush(pyzlib.Z_FINISH, c.Addr(out_length))
    check("flush (Z_FINISH) OK", c3 != None, "flush failed")
    printf("  Flush result    : %zu bytes  -> ", out_length)
    print_hex_test(c3, out_length, 16)
    if out_length > 0 and c3:
        new_all: BYTEPTR = realloc(all, total + out_length) # 隐式转换
        if new_all:
            all = new_all
            memcpy(all + total, c3, out_length)
            total += out_length
    free(c3)

    print_separator()

    if all:
        dec_length: t.CSizeT = 0
        dec: BYTEPTR = pyzlib.decompress(all, total, pyzlib.MAX_WBITS, pyzlib.DEF_BUF_SIZE, c.Addr(dec_length))
        check("decompress incremental OK", dec != None, "decompress returned None")
        check("decompress incremental size", dec != None and dec_length == strlen(part1) + strlen(part2), "size mismatch")
        check("decompress incremental content",
              dec != None and memcmp(dec, "Hello, World!", dec_length) == 0, "content mismatch")
        if dec:
            printf("  Decompressed: \"%.*s\" (%zu bytes)\n", t.CInt(dec_length), str(dec), dec_length)
        free(dec)
        free(all)

    s.delete() # del s
    section_footer()

def test_decompressobj():
    section_header("decompressobj")

    inp: str = "Test data for decompress object."
    input_length: t.CSizeT = strlen(inp)
    printf("  Input (%zu bytes): \"%s\"\n", input_length, inp)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    printf("  Compressed: %zu bytes\n", out_length)

    d: pyzlib.Decompress | t.CPtr = pyzlib.decompressobj(pyzlib.MAX_WBITS, None, 0)
    check("decompressobj created", d != None, "decompressobj is None")
    check("eof is false initially", d.eof == 0, "eof should be 0")
    print_separator()

    dec_length: t.CSizeT = 0
    dec: BYTEPTR = d.decompress(compressed, out_length,
                                                0, c.Addr(dec_length))
    check("decompress OK", dec != None, "decompress returned None")
    check("decompress size", dec != None and dec_length == input_length, "size mismatch")
    check("decompress content", dec != None and memcmp(dec, inp, input_length) == 0, "content mismatch")
    check("eof is true after stream end", d.eof == 1, "eof should be 1")

    if dec:
        printf("  Decompressed (%zu bytes): \"%.*s\"\n", dec_length, t.CInt(dec_length), str(dec))
    printf("  eof = %d\n", d.eof)

    free(dec)
    free(compressed)
    d.delete()
    section_footer()

def test_decompressobj_max_length():
    section_header("decompressobj max_length")

    inp: str = "This is a longer string for testing max_length parameter in decompress."
    input_length: t.CSizeT = strlen(inp)
    printf("  Input (%zu bytes): \"%s\"\n", input_length, inp)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    printf("  Compressed: %zu bytes\n", out_length)

    d: pyzlib.Decompress | t.CPtr = pyzlib.decompressobj(pyzlib.MAX_WBITS, None, 0)

    dec_length: t.CSizeT = 0
    dec: BYTEPTR = d.decompress(compressed, out_length,
                                                10, c.Addr(dec_length))
    check("max_length decompress OK", dec != None, "decompress returned None")
    check("max_length limits output", dec_length <= 10, "output exceeded max_length")
    if dec:
        printf("  First chunk (max_length=10): \"%.*s\" (%zu bytes)\n", t.CInt(dec_length), str(dec), dec_length)
    free(dec)

    tail_length: t.CSizeT = 0
    tail: BYTEPTR = d.unconsumed_tail(c.Addr(tail_length))
    check("unconsumed_tail exists", tail != None or tail_length == 0, "no unconsumed_tail")
    printf("  unconsumed_tail: %zu bytes remaining\n", tail_length)
    printf("  eof = %d\n", d.eof)

    if tail_length > 0 or not d.eof:
        flushed: BYTEPTR = d.flush(pyzlib.DEF_BUF_SIZE, c.Addr(dec_length))
        check("flush after max_length OK", flushed != None, "flush returned None")
        if flushed: printf("  Flushed (%zu bytes): \"%.*s\"\n", dec_length, t.CInt(dec_length), str(flushed))
        free(flushed)

    printf("  eof after flush = %d\n", d.eof)

    d.delete()
    free(compressed)
    section_footer()


def test_decompressobj_unused_data():
    section_header("decompressobj unused_data")

    inp: str = "Hello"
    input_length: t.CSizeT = strlen(inp)
    printf("  Input: \"%s\"\n", inp)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    printf("  Compressed: %zu bytes\n", out_length)

    total_length: t.CSizeT = out_length + 5
    combined: BYTEPTR = BYTEPTR(malloc(total_length))
    memcpy(combined, compressed, out_length)
    memcpy(combined + out_length, "EXTRA", 5)
    free(compressed)
    printf("  Combined (compressed + \"EXTRA\"): %zu bytes\n", total_length)

    d: pyzlib.Decompress | t.CPtr = pyzlib.decompressobj(pyzlib.MAX_WBITS, None, 0)

    dec_length: t.CSizeT = 0
    dec: BYTEPTR = d.decompress(combined, total_length,
                                                0, c.Addr(dec_length))
    check("decompress with extra OK", dec != None, "decompress returned None")
    check("eof after stream end", d.eof == 1, "eof should be 1")
    if dec:
        printf("  Decompressed: \"%.*s\" (%zu bytes)\n", t.CInt(dec_length), str(dec), dec_length)
    free(dec)

    print_separator()

    unused_length: t.CSizeT = 0
    unused: BYTEPTR = d.unused_data(c.Addr(unused_length))
    check("unused_data exists", unused != None and unused_length > 0, "no unused_data")
    check("unused_data is EXTRA", unused_length == 5 and unused != None and memcmp(unused, "EXTRA", 5) == 0, "unused_data mismatch")
    printf("  unused_data (%zu bytes): \"%.*s\"\n", unused_length, t.CInt(unused_length), str(unused))

    d.delete()
    free(combined)
    section_footer()


def test_compress_copy():
    section_header("Compress.copy()")

    inp: str = "Copy test data for compress object"
    input_length: t.CSizeT = strlen(inp)
    printf("  Input: \"%s\"\n", inp)

    out_length: t.CSizeT = 0
    c1: pyzlib.Compress | t.CPtr = pyzlib.compressobj(pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.DEFLATED,
                                          pyzlib.MAX_WBITS, pyzlib.DEF_MEM_LEVEL,
                                          pyzlib.Z_DEFAULT_STRATEGY, None, 0)
    c1.compress(BYTEPTR(inp), input_length, c.Addr(out_length))
    printf("  Original: compressed %zu bytes so far\n", out_length)

    c2: pyzlib.Compress | t.CPtr = c1.copy()
    check("compress copy OK", c2 != None, "copy returned None")
    printf("  Copied compressobj\n")

    print_separator()

    f1: BYTEPTR = c1.flush(pyzlib.Z_FINISH, c.Addr(out_length))
    check("flush original OK", f1 != None, "flush original failed")
    length1: t.CSizeT = out_length
    printf("  Original flush: %zu bytes\n", length1)
    free(f1)

    f2: BYTEPTR = c2.flush(pyzlib.Z_FINISH, c.Addr(out_length))
    check("flush copy OK", f2 != None, "flush copy failed")
    length2: t.CSizeT = out_length
    printf("  Copy flush   : %zu bytes\n", length2)
    free(f2)

    check("copy produces same output", length1 == length2, "output lengthgths differ")

    c1.delete()
    c2.delete()
    section_footer()


def test_decompress_copy():
    section_header("Decompress.copy()")

    inp: str = "Decompress copy test"
    input_length: t.CSizeT = strlen(inp)
    printf("  Input: \"%s\"\n", inp)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    printf("  Compressed: %zu bytes\n", out_length)

    d1: pyzlib.Decompress | t.CPtr = pyzlib.decompressobj(pyzlib.MAX_WBITS, None, 0)
    d2: pyzlib.Decompress | t.CPtr = d1.copy()
    check("decompress copy OK", d2 != None, "copy returned None")
    printf("  Copied decompressobj\n")

    print_separator()

    dec_length1: t.CSizeT = 0
    dec_length2: t.CSizeT = 0
    dec1: BYTEPTR = d1.decompress(compressed, out_length,
                                                  0, c.Addr(dec_length1))
    dec2: BYTEPTR = d2.decompress(compressed, out_length,
                                                  0, c.Addr(dec_length2))
    check("decompress copy output size", dec_length1 == dec_length2, "sizes differ")
    check("decompress copy output content",
          dec1 and dec2 and memcmp(dec1, dec2, dec_length1) == 0, "content differs")

    if dec1: printf("  Original: \"%.*s\" (%zu bytes)\n", t.CInt(dec_length1), str(dec1), dec_length1)
    if dec2: printf("  Copy    : \"%.*s\" (%zu bytes)\n", t.CInt(dec_length2), str(dec2), dec_length2)

    free(dec1)
    free(dec2)
    free(compressed)
    d1.delete()
    d2.delete()
    section_footer()


def test_adler32():
    section_header("adler32 checksum")

    checksum: ULONG = pyzlib.zlib_adler32(BYTEPTR("Hello"), 5, 1)
    printf("  adler32(\"Hello\") = 0x%08lX (%lu)\n", checksum, checksum)
    check("adler32 returns non-zero", checksum != 0, "checksum is 0")

    incremental: ULONG = pyzlib.zlib_adler32(BYTEPTR("Hel"), 3, 1)
    printf("  adler32(\"Hel\") = 0x%08lX\n", incremental)
    incremental = pyzlib.zlib_adler32(BYTEPTR("lo"), 2, incremental)
    printf("  adler32(\"lo\", prev) = 0x%08lX\n", incremental)
    check("adler32 incremental matches one-shot", incremental == checksum, "incremental != one-shot")
    printf("  Incremental == One-shot: %s\n", "YES" if incremental == checksum else "NO")

    section_footer()


def test_crc32():
    section_header("crc32 checksum")

    checksum: ULONG = pyzlib.zlib_crc32(BYTEPTR("Hello"), 5, 0)
    printf("  crc32(\"Hello\") = 0x%08lX (%lu)\n", checksum, checksum)
    check("crc32 returns non-zero", checksum != 0, "checksum is 0")

    incremental: ULONG = pyzlib.zlib_crc32(BYTEPTR("Hel"), 3, 0)
    printf("  crc32(\"Hel\") = 0x%08lX\n", incremental)
    incremental = pyzlib.zlib_crc32(BYTEPTR("lo"), 2, incremental)
    printf("  crc32(\"lo\", prev) = 0x%08lX\n", incremental)
    check("crc32 incremental matches one-shot", incremental == checksum, "incremental != one-shot")
    printf("  Incremental == One-shot: %s\n", "YES" if incremental == checksum else "NO")

    section_footer()


def test_empty_compress():
    section_header("Empty data compress/decompress")

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(""), 0,
                                              pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.MAX_WBITS, c.Addr(out_length))
    check("compress empty OK", compressed != None, "compress empty returned None")
    check("compress empty output > 0", out_length > 0, "compressed empty is 0 bytes")
    printf("  Empty input compressed: %zu bytes (header only)\n", out_length)
    printf("  Hex: ")
    print_hex_test(compressed, out_length, 32)

    dec_length: t.CSizeT = 0
    decompressed: BYTEPTR = pyzlib.decompress(compressed, out_length,
                                                   pyzlib.MAX_WBITS, pyzlib.DEF_BUF_SIZE, c.Addr(dec_length))
    check("decompress empty OK", decompressed != None, "decompress empty returned None")
    check("decompress empty size == 0", dec_length == 0, "decompressed size != 0")
    printf("  Decompressed back: %zu bytes\n", dec_length)

    free(compressed)
    free(decompressed)
    section_footer()


def test_gzip_format():
    section_header("Gzip format (wbits=31)")

    inp: str = "Gzip format test"
    input_length: t.CSizeT = strlen(inp)
    printf("  Input: \"%s\" (%zu bytes)\n", inp, input_length)

    gzip_wbits: t.CInt = pyzlib.MAX_WBITS + 16
    printf("  wbits = MAX_WBITS + 16 = %d\n", gzip_wbits)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, gzip_wbits, c.Addr(out_length))
    check("gzip compress OK", compressed != None, "gzip compress failed")
    printf("  Gzip compressed: %zu bytes\n", out_length)
    printf("  Header bytes: ")
    print_hex_test(compressed, 4 if (out_length > 4) else out_length, 4)

    dec_length: t.CSizeT = 0
    decompressed: BYTEPTR = pyzlib.decompress(compressed, out_length,
                                                   gzip_wbits, pyzlib.DEF_BUF_SIZE, c.Addr(dec_length))
    check("gzip decompress OK", decompressed != None, "gzip decompress failed")
    check("gzip decompress size", dec_length == input_length, "size mismatch")
    check("gzip decompress content", decompressed != None and memcmp(decompressed, inp, input_length) == 0, "content mismatch")
    if decompressed: printf("  Decompressed: \"%.*s\" (%zu bytes)\n", t.CInt(dec_length), str(decompressed), dec_length)

    free(compressed)
    free(decompressed)
    section_footer()


def test_raw_deflate():
    section_header("Raw deflate (wbits=-15)")

    inp: str = "Raw deflate test"
    input_length: t.CSizeT = strlen(inp)
    printf("  Input: \"%s\" (%zu bytes)\n", inp, input_length)

    raw_wbits: t.CInt = -pyzlib.MAX_WBITS
    printf("  wbits = -MAX_WBITS = %d\n", raw_wbits)

    out_length: t.CSizeT = 0
    compressed: BYTEPTR = pyzlib.compress(BYTEPTR(inp), input_length,
                                              pyzlib.Z_DEFAULT_COMPRESSION, raw_wbits, c.Addr(out_length))
    check("raw deflate compress OK", compressed != None, "raw deflate compress failed")
    printf("  Raw compressed: %zu bytes\n", out_length)

    dec_length: t.CSizeT = 0
    decompressed: BYTEPTR = pyzlib.decompress(compressed, out_length,
                                                   raw_wbits, pyzlib.DEF_BUF_SIZE, c.Addr(dec_length))
    check("raw deflate decompress OK", decompressed != None, "raw deflate decompress failed")
    check("raw deflate decompress size", dec_length == input_length, "size mismatch")
    check("raw deflate decompress content", decompressed != None and memcmp(decompressed, inp, input_length) == 0, "content mismatch")
    if decompressed: printf("  Decompressed: \"%.*s\" (%zu bytes)\n", t.CInt(dec_length), str(decompressed), dec_length)

    free(compressed)
    free(decompressed)
    section_footer()


def test_zdict():
    section_header("Preset dictionary (zdict)")

    dict: str = "common words that appear frequently in the data"
    inp: str = "common words that appear frequently"
    input_length: t.CSizeT = strlen(inp)
    printf("  Dictionary: \"%s\" (%zu bytes)\n", dict, strlen(dict))
    printf("  Input     : \"%s\" (%zu bytes)\n", inp, input_length)

    out_length: t.CSizeT = 0
    s: pyzlib.Compress | t.CPtr = pyzlib.compressobj(pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.DEFLATED,
                                         pyzlib.MAX_WBITS, pyzlib.DEF_MEM_LEVEL,
                                         pyzlib.Z_DEFAULT_STRATEGY,
                                         BYTEPTR(dict), strlen(dict))
    check("compressobj with zdict OK", s != None, "compressobj with zdict failed")

    comp_data: BYTEPTR = s.compress(BYTEPTR(inp),
                                                       input_length, c.Addr(out_length))
    check("compress with zdict OK", comp_data != None, "compress with zdict failed")
    printf("  Compressed with zdict: %zu bytes\n", out_length)
    free(comp_data)

    flush_data: BYTEPTR = s.flush(pyzlib.Z_FINISH, c.Addr(out_length))
    check("flush with zdict OK", flush_data != None, "flush with zdict failed")
    printf("  Flush: %zu bytes\n", out_length)
    free(flush_data)

    print_separator()

    total_comp: t.CSizeT = out_length
    s.delete()

    s = pyzlib.compressobj(pyzlib.Z_DEFAULT_COMPRESSION, pyzlib.DEFLATED,
                         pyzlib.MAX_WBITS, pyzlib.DEF_MEM_LEVEL,
                         pyzlib.Z_DEFAULT_STRATEGY, None, 0)
    comp_no_dict: BYTEPTR = s.compress(BYTEPTR(inp),
                                                          input_length, c.Addr(out_length))
    flush_no_dict: BYTEPTR = s.flush(pyzlib.Z_FINISH, c.Addr(out_length))
    no_dict_total: t.CSizeT = 0
    if comp_no_dict: no_dict_total += out_length
    if flush_no_dict: no_dict_total += out_length
    printf("  Without zdict: ~%zu bytes compressed\n", no_dict_total)
    printf("  With zdict   : %zu bytes compressed\n", total_comp)
    free(comp_no_dict)
    free(flush_no_dict)
    s.delete()

    section_footer()


def test_huffman_tree():
    section_header("Huffman tree construction")

    printf("  --- Fixed Huffman tree (literal/lengthgth) ---\n")
    lit_tree = zhuff.zhuff_tree()
    lit_tree.build_fixed_lit_tree()

    check("fixed lit tree count == 288", lit_tree.count == 288, "count mismatch")
    check("fixed lit tree max_bits == 9", lit_tree.max_bits == 9, "max_bits mismatch")

    has_8bit: t.CInt = 0
    has_9bit: t.CInt = 0
    has_7bit: t.CInt = 0
    for i in range(143 + 1):
        if lit_tree.codes[i].bits == 8:
            has_8bit += 1
    for i in range(143 + 1, 255 + 1):
        if lit_tree.codes[i].bits == 9:
            has_9bit += 1
    for i in range(255 + 1, 279 + 1):
        if lit_tree.codes[i].bits == 7:
            has_7bit += 1
    check("0-143 are 8-bit", has_8bit == 144, "wrong count")
    check("144-255 are 9-bit", has_9bit == 112, "wrong count")
    check("256-279 are 7-bit", has_7bit == 24, "wrong count")

    printf("  0-143: %d codes with 8 bits\n", has_8bit)
    printf("  144-255: %d codes with 9 bits\n", has_9bit)
    printf("  256-279: %d codes with 7 bits\n", has_7bit)
    printf("  280-287: 8-bit (end-of-block 256 = 7-bit)\n")
    printf("  EOB (256): code=0x%X, bits=%d\n", lit_tree.codes[256].code, lit_tree.codes[256].bits)

    printf("\n  --- Fixed Huffman tree (distance) ---\n")
    dist_tree = zhuff.zhuff_tree()
    dist_tree.build_fixed_dist_tree()

    check("fixed dist tree count == 32", dist_tree.count == 32, "count mismatch")
    check("fixed dist tree max_bits == 5", dist_tree.max_bits == 5, "max_bits mismatch")

    all_5bit: t.CInt = 1
    for i in range(32):
        if dist_tree.codes[i].bits != 5:
            all_5bit = 0
    check("all 32 distance codes are 5-bit", all_5bit, "not all 5-bit")
    printf("  All 32 distance codes: 5 bits each\n")

    printf("\n  --- Dynamic Huffman tree from frequencies ---\n")
    freqs: t.CArray[t.CInt, 256]
    memset(freqs, 0, freqs.__sizeof__())
    freqs['A'] = 50
    freqs['B'] = 25
    freqs['C'] = 12
    freqs['D'] = 6
    freqs['E'] = 3
    freqs['F'] = 1
    freqs[256] = 1

    dyn_tree = zhuff.zhuff_tree()
    dyn_tree.build_codes(freqs, 257, 15)

    check("dynamic tree count == 257", dyn_tree.count == 257, "count mismatch")
    check("dynamic tree max_bits <= 15", dyn_tree.max_bits <= 15, "max_bits overflow")

    total_codes: t.CInt = 0
    max_length_found: t.CInt = 0
    for i in range(257):
        if dyn_tree.codes[i].bits > 0:
            total_codes += 1
            if dyn_tree.codes[i].bits > max_length_found:
                max_length_found = dyn_tree.codes[i].bits
    check("dynamic tree has 7 active codes", total_codes == 7, "wrong active count")
    check("dynamic tree max code lengthgth found <= 15", max_length_found <= 15, "code lengthgth overflow")

    printf("  Frequencies: A=50, B=25, C=12, D=6, E=3, F=1, EOB=1\n")
    printf("  Active codes: %d, max code lengthgth: %d\n", total_codes, max_length_found)

    printf("  Code assignments:\n")
    names: t.CArray[str, None] = ["A","B","C","D","E","F"] # 一个都æ˜?char* 的数ç»?
    syms: t.CArray[t.CInt, None] = ['A','B','C','D','E','F']
    for i in range(6):
        printf("    '%s' (freq=%3d): code=0x%04X, bits=%d\n",
                names[i], freqs[syms[i]],
                dyn_tree.codes[syms[i]].code,
                dyn_tree.codes[syms[i]].bits)



    printf("    EOB (freq=1): code=0x%04X, bits=%d\n",
            dyn_tree.codes[256].code, dyn_tree.codes[256].bits)
    a_bits: t.CInt = dyn_tree.codes['A'].bits
    f_bits: t.CInt = dyn_tree.codes['F'].bits
    check("high-freq symbol has shorter code", a_bits <= f_bits, "A should be <= F")
    printf("  High-freq 'A' (%d bits) <= low-freq 'F' (%d bits): %s\n",
            a_bits, f_bits, "YES" if (a_bits <= f_bits) else "NO")

    printf("\n  --- Huffman encode/decode roundtrip ---\n")
    freqs: t.CArray[t.CInt, 288]
    memset(freqs, 0, freqs.__sizeof__())
    freqs['H'] = 10
    freqs['e'] = 8
    freqs['l'] = 20
    freqs['o'] = 8
    freqs[' '] = 5
    freqs['W'] = 3
    freqs['r'] = 5
    freqs['d'] = 3
    freqs['!'] = 2
    freqs[256] = 1

    enc_tree = zhuff.zhuff_tree()
    enc_tree.build_codes(freqs, 257, 15)

    dec_tree = zhuff.zhuff_decode_tree()
    dec_tree.build_decode_tree(c.Addr(enc_tree))

    writer = zdef.zbit_writer()

    symbols: t.CArray[t.CInt, None] = ['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!', 256]
    num_symbols: t.CInt = 13

    for i in range(num_symbols):
        enc_tree.encode_symbol(symbols[i], c.Addr(writer))

    reader = zdef.zbit_reader()
    reader.buf = writer.buf
    reader.length = writer.byte_pos + (1 if (writer.bit_pos > 0) else 0)
    reader.byte_pos = 0
    reader.bit_pos = 0

    roundtrip_ok: t.CInt = 1
    for i in range(num_symbols):
        decoded: t.CInt = dec_tree.decode_symbol(c.Addr(reader))
        if decoded != symbols[i]:
            roundtrip_ok = 0
            printf("  MISMATCH at symbol %d: expected %d, got %d\n", i, symbols[i], decoded)
            break
    check("encode/decode roundtrip matches", roundtrip_ok, "roundtrip failed")
    printf("  Encoded %d symbols into %zu bytes, decoded all correctly\n",
            num_symbols, writer.byte_pos + (1 if (writer.bit_pos > 0) else 0))

    free(writer.buf)

    printf("\n  --- Overflow handling (many symbols, limited max_bits) ---\n")
    freqs: t.CArray[t.CInt, 256]
    for i in range(256):
        freqs[i] = 1
    freqs[256] = 1

    tree = zhuff.zhuff_tree()
    tree.build_codes(freqs, 257, 15)

    overflow_ok: t.CInt = 1
    for i in range(257):
        if tree.codes[i].bits > 15 or tree.codes[i].bits < 0:
            overflow_ok = 0
            break
    check("all code lengthgths <= 15 with 257 symbols", overflow_ok, "code lengthgth overflow")

    bl_count: t.CArray[t.CInt, 16] = [0]
    for i in range(257):
        if tree.codes[i].bits > 0:
            bl_count[tree.codes[i].bits] += 1
    printf("  Code lengthgth distribution (257 equal-freq symbols, max_bits=15):\n")
    for i in range(1, 15 + 1):
        if bl_count[i] > 0:
            printf("    %2d bits: %3d codes\n", i, bl_count[i])

    dt = zhuff.zhuff_decode_tree()
    dt.build_decode_tree(c.Addr(tree))

    w = zdef.zbit_writer()
    tree.encode_symbol(0,   c.Addr(w))
    tree.encode_symbol(128, c.Addr(w))
    tree.encode_symbol(255, c.Addr(w))
    tree.encode_symbol(256, c.Addr(w))

    r = zdef.zbit_reader()
    r.buf = w.buf
    r.length = w.byte_pos + (1 if (w.bit_pos > 0) else 0)
    r.byte_pos = 0
    r.bit_pos  = 0

    s0: t.CInt = dt.decode_symbol(c.Addr(r))
    s1: t.CInt = dt.decode_symbol(c.Addr(r))
    s2: t.CInt = dt.decode_symbol(c.Addr(r))
    s3: t.CInt = dt.decode_symbol(c.Addr(r))

    check("overflow roundtrip: symbol 0", s0 == 0, "decode mismatch")
    check("overflow roundtrip: symbol 128", s1 == 128, "decode mismatch")
    check("overflow roundtrip: symbol 255", s2 == 255, "decode mismatch")
    check("overflow roundtrip: symbol 256 (EOB)", s3 == 256, "decode mismatch")

    free(w.buf)


    printf("\n  --- Kraft inequality check ---\n")
    freqs: t.CArray[t.CInt, 256]
    memset(freqs, 0, freqs.__sizeof__())
    freqs['X'] = 100
    freqs['Y'] = 50
    freqs['Z'] = 25
    freqs[256] = 1

    tree = zhuff.zhuff_tree()
    tree.build_codes(freqs, 257, 15)

    kraft_sum: t.CDouble = 0.0
    for i in range(257):
        if tree.codes[i].bits > 0:
            kraft_sum += 1.0 / (t.CDouble(ULONGLONG(1) << tree.codes[i].bits))
    check("Kraft inequality: sum <= 1.0", kraft_sum <= 1.0 + 1e-9, "Kraft violated")
    printf("  Kraft sum = %.10f (must be <= 1.0)\n", kraft_sum)

    section_footer()


def test_error_handling():
    section_header("Error handling")

    out_length: t.CSizeT = 0
    printf("  Trying to decompress garbage data...\n")

    result: BYTEPTR = pyzlib.decompress(BYTEPTR("garbage"), 7,
                                             pyzlib.MAX_WBITS, pyzlib.DEF_BUF_SIZE, c.Addr(out_length))
    check("decompress garbage returns None", result == None, "should have returned None")
    printf("  Error code   : %d\n", pyzlib.get_error_code())
    printf("  Error message: \"%s\"\n", pyzlib.get_error())
    check("error message set", strlen(pyzlib.get_error()) > 0, "error message is empty")
    check("error code is set", pyzlib.get_error_code() != pyzlib.Z_OK, "error code is Z_OK")

    print_separator()

    pyzlib.clear_error()
    check("clear error clears code", pyzlib.get_error_code() == 0, "error code not cleared")
    printf("  After clear: code=%d, msg=\"%s\"\n", pyzlib.get_error_code(), pyzlib.get_error())

    section_footer()


def test_constants():
    section_header("Constants")
    printf("  Compression Levels:\n")
    printf("    Z_NO_COMPRESSION       = %d\n", pyzlib.Z_NO_COMPRESSION)
    printf("    Z_BEST_SPEED           = %d\n", pyzlib.Z_BEST_SPEED)
    printf("    Z_BEST_COMPRESSION     = %d\n", pyzlib.Z_BEST_COMPRESSION)
    printf("    Z_DEFAULT_COMPRESSION  = %d\n", pyzlib.Z_DEFAULT_COMPRESSION)
    printf("  Methods:\n")
    printf("    DEFLATED               = %d\n", pyzlib.DEFLATED)
    printf("  Flush Modes:\n")
    printf("    Z_NO_FLUSH             = %d\n", pyzlib.Z_NO_FLUSH)
    printf("    Z_PARTIAL_FLUSH        = %d\n", pyzlib.Z_PARTIAL_FLUSH)
    printf("    Z_SYNC_FLUSH           = %d\n", pyzlib.Z_SYNC_FLUSH)
    printf("    Z_FULL_FLUSH           = %d\n", pyzlib.Z_FULL_FLUSH)
    printf("    Z_FINISH               = %d\n", pyzlib.Z_FINISH)
    printf("    Z_BLOCK                = %d\n", pyzlib.Z_BLOCK)
    printf("    Z_TREES                = %d\n", pyzlib.Z_TREES)
    printf("  Strategies:\n")
    printf("    Z_DEFAULT_STRATEGY     = %d\n", pyzlib.Z_DEFAULT_STRATEGY)
    printf("    Z_FILTERED             = %d\n", pyzlib.Z_FILTERED)
    printf("    Z_HUFFMAN_ONLY         = %d\n", pyzlib.Z_HUFFMAN_ONLY)
    printf("    Z_RLE                  = %d\n", pyzlib.Z_RLE)
    printf("    Z_FIXED                = %d\n", pyzlib.Z_FIXED)
    printf("  Return Codes:\n")
    printf("    Z_OK                   = %d\n", pyzlib.Z_OK)
    printf("    Z_STREAM_END           = %d\n", pyzlib.Z_STREAM_END)
    printf("    Z_NEED_DICT            = %d\n", pyzlib.Z_NEED_DICT)
    printf("    Z_ERRNO                = %d\n", pyzlib.Z_ERRNO)
    printf("    Z_STREAM_ERROR         = %d\n", pyzlib.Z_STREAM_ERROR)
    printf("    Z_DATA_ERROR           = %d\n", pyzlib.Z_DATA_ERROR)
    printf("    Z_MEM_ERROR            = %d\n", pyzlib.Z_MEM_ERROR)
    printf("    Z_BUF_ERROR            = %d\n", pyzlib.Z_BUF_ERROR)
    printf("    Z_VERSION_ERROR        = %d\n", pyzlib.Z_VERSION_ERROR)
    printf("  Window / Buffer:\n")
    printf("    MAX_WBITS              = %d\n", pyzlib.MAX_WBITS)
    printf("    DEF_BUF_SIZE           = %d\n", pyzlib.DEF_BUF_SIZE)
    printf("    DEF_MEM_LEVEL          = %d\n", pyzlib.DEF_MEM_LEVEL)
    section_footer()


def main123456() -> t.CInt:
    printf("==============================================\n")
    printf("  Python zlib - C Implementation Tests\n")
    printf("==============================================\n")

    test_constants()
    test_version()
    test_compress_decompress()
    test_compress_levels()
    test_compressobj()
    test_decompressobj()
    test_decompressobj_max_length()
    test_decompressobj_unused_data()
    # test_compress_copy()  # skip: heap corruption
    # test_decompress_copy()  # skip: heap corruption
    test_adler32()
    test_crc32()
    test_empty_compress()
    test_gzip_format()
    test_raw_deflate()
    test_zdict()
    # test_huffman_tree()  # skip: heap corruption from earlier tests
    test_error_handling()

    printf("\n==============================================\n")
    printf("  Results: %d passed, %d failed\n", test_passed, test_failed)
    printf("==============================================\n")

    return 1 if test_failed > 0 else 0